Typically, we categorize IoT devices into three types: ① No mobility, large data volume (uplink), requiring a wide frequency band, such as urban surveillance cameras. ② High mobility, requiring frequent switching, small data volume, such as fleet tracking management. ③ No mobility, small data volume, not sensitive to latency, such as smart metering. NB-IoT was … Read more
1. LiteOS OC COAP Abstract Component Overview To accommodate various modes of using CoAP to connect to Huawei OC, this layer interface is adopted, providing the necessary interfaces for applications above and allowing flexible adaptation of access methods below. The OC COAP AL API interface is declared in <oc_coap_al.h>, and you need to include this … Read more
“For the Internet of Things, the most important aspect is communication with devices. Currently, the common communication protocols in IoT include: MQTT, CoAP, HTTP, XMPP, SoAP“ 01 — MQTT MQTT (Message Queuing Telemetry Transport) was originally developed by IBM as an instant messaging protocol. The MQTT protocol is designed for communication between remote sensors and … Read more
↑ Click the above“IoT Time and Space” to follow us Reprint must indicate the source: “IoT Time and Space” WeChat official account (IoT-LPWAN)。 The main IoT application layer protocols include CoAP, MQTT, XMPP, HTTP, etc. The “IoT Time and Space” public account will analyze and compare these protocols separately. First, let’s take a look at … Read more
A new protocol support has been added to the IoT access — CoAP (Constrained Application Protocol)! What is IoT access? It is a fully managed cloud service developed by Baidu Smart Cloud’s Tiangong team, which helps the Internet of Things establish secure and reliable bidirectional connections and device management between devices and the cloud. It … Read more
Hands-On Writing of UDP Protocol Stack Series No. Content 1 “Hands-On Writing of UDP Protocol Stack – UDP Protocol Stack Format” 2 “Hands-On Writing of UDP Protocol Stack – DHCP Message Parsing” 3 “Hands-On Writing of UDP Protocol Stack – OTA Host” 4 “Hands-On Writing of UDP Protocol Stack – DNS Message Parsing” 5 “Hands-On … Read more
1. HTTP—Implementation of RESTful Architecture When it comes to HTTP, I believe everyone is familiar with it. HTTP stands for Hyper Text Transfer Protocol. When we normally visit a website http://www.baidu.com/index.html, we are actually using the HTTP protocol to retrieve (GET) the content of the file located at www.baidu.com/index.html on the internet, which is then … Read more
Click on the arrow“blue text”, follow us! Californium (Cf): Java’s CoAP Protocol Library! Hello everyone, I am Niu Ge. Today we will talk about a “chemical element” in the Java IoT world— the Californium framework. Don’t be scared by its name; this is not a chemistry experiment, but a powerful and practical CoAP protocol framework. … Read more
In today’s wave of digitalization, the Internet of Things (IoT) is booming at an unprecedented pace, profoundly changing our ways of living and working. From smart home systems to industrial automation control, from smart health monitoring devices to intelligent traffic management, IoT connects various physical devices to the network, enabling information exchange and collaborative work … Read more
The CoAP protocol is an IoT protocol that supports communication between constrained devices operating in constrained networks. Therefore, the CoAP protocol is designed to be very lightweight and uses the UDP protocol for data transmission, making it well-suited for constrained network environments. CoAP operates in a manner similar to HTTP, allowing operations on abstract resources … Read more